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Linux.com: CLI Magic: locate, slocate, and rlocate

"Sometimes you need to find a file right now, and you don't want
to search for it one directory after another. That's the time to
visit the CLI and locate the missing file. Or slocate it, depending
on your distribution. There is just one problem with using locate
or slocate, and that's staying up to date. Here's how they work and
how to use them, and a brief tease on rlocate,their nimble, more
timely, heir apparent.

"Slocate and locate both do essentially the same thing: search a
database containing the file names and locations on the system for
a match and report all that are found. Both count on another
program--updatedb--to do the heavy lifting by creating/maintaining
the database to be searched..."